LMV1088

LMV1088 Dual Input, Far Field Noise Suppression Microphone Amplifier with Automatic Calibration Ability December 10, 2007 LMV1088 Dual Input, Far Field Noise Suppression Microphone Amplifier with Automatic Calibration Ability General Description The LMV1088 is a fully analog dual input microphone array amplifier designed to reduce background acoustic noise, while delivering superb speech clarity in voice communications applications. The LMV1088 incorporates calibration circuitry which may be www.DataSheet4U.com initiated by either an I2C command or by a logic level control on a separate input pin. The calibration sequence compensates for gain and frequency response variations of the microphones used with the LMV1088, eliminating the need to use expensive matched microphone sets. The calibration data is stored in the internal EEPROM memory. The LMV1088 has two differential input microphone amplifier channels plus far field noise suppression (FFNS) processing circuitry. The amplifiers and FFNS circuitry are adjustable for gain differences in the MIC channels of +/- 3dB. The frequency response variations of the microphones over the voice band frequency range can also be adjusted for differences of +/-3dB. The compensation or calibration function is achieved via memory stored coefficients. These are determined when the FFNS calibration fuction is activated. The purpose of the calibration sequence is to choose the optimized coefficients for the FFNS circuitry for the given micro...